For straight up modding: definitely the Xbox. The 007 and Mechwarrior bugs blew everything wide open, and the fact that it was just a PC with real (upgradeable!) storage spawned projects like XBMC, now known as Kodi: https://en.wikipedia.org/wiki/Kodi_(software)
And also piracy was rampant, but not the Swapmagic or Modchip kind. You could just upgrade the drive, _backup_ your games on there, and play 'em all of the drive.
The Wii and 3DS are also suuuuper open and hackable though. The homebrew scenes on both are incredibly impressive, not to mention the whole ecosystem of full blown launchers and shells and stuff. (Which, now that I think about it, was also a big deal on Xbox.)
For straight up modding: definitely the Xbox. The 007 and Mechwarrior bugs blew everything wide open, and the fact that it was just a PC with real (upgradeable!) storage spawned projects like XBMC, now known as Kodi: https://en.wikipedia.org/wiki/Kodi_(software)
And also piracy was rampant, but not the Swapmagic or Modchip kind. You could just upgrade the drive, _backup_ your games on there, and play 'em all of the drive.
The Wii and 3DS are also suuuuper open and hackable though. The homebrew scenes on both are incredibly impressive, not to mention the whole ecosystem of full blown launchers and shells and stuff. (Which, now that I think about it, was also a big deal on Xbox.)